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Click on the icons to know the possible uses of the constraints :
Add a Locked constraint to fix part(s).
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
It is essential that a part (or sub-assembly) is
immobilized in the
geometric reference system so that
the other objects are positioned
on it and not the other
way around, at the risk of having a
positioning of the
assembly very fanciful for possible future
projections.
But it is still possible to move the object
with the tool  .
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Attachment : Adds a relative immobilization constraint between the selected entities of the parts.
Like PlaneCoincidant, this constraint positions the parts according to the designated constraint elements : the induced plane faces coincide in their centers with a possible correction BUT by removing all the DOFs.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
The position of the part thus constrained relative to the reference part can be adjusted according to and around the axes linked to the reference element :
Click on the constraint element concerned, then go to Link > Offset.
This constraint makes it possible to save the resources of the solver.
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Add a PlaneCoincident constraint to coincide planar faces of two or more parts.
The faces are coincided at their centers with an optional distance.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
This constraint seems to be a specificity of Assembly 3 WB.
It allows to delete in one step all the DOFs except the rotation around the axis of the cylindrical part (pivot link).
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Add a PlaneAlignment constraint to align planar faces of two or more parts.
The faces become coplanar or parallel with an optional distance.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
The solver is able to support several constraints on non-parallel planes, thus redundant DOF deletions, which allows, for example, to provide guidance to a single DOF in translation (slide link).
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Add a AxialAlignment constraint to align edges / faces of two or more parts.
The constraint acceps linear edges, which become colinear, and planar faces, which are aligned uses their surface normal axis, and cylindrical face, which are aligned using the axial direction. Different types of geometry elements can be mixed.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
This constraint makes it possible to eliminate in one step all the DOFs except the rotation about the axis of the cylindrical part and the translation along this axis (sliding pivot link).
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Add a PointsCoincident constraint to coincide two points in 2D or 3D.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
The points taken into consideration here are the centers of spherical surfaces.
This constraint makes it possible to eliminate in one step all the DOFs except the 3 rotations about the center of the spherical part (spherical link).
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Add a PointInPlane to constrain one or more point inside a plane.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
Only one DOF is eliminated by this constraint : the translation according to the normal to the plane.
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Add a PointsPlaneDistance to constrain the distance between one or more points and a plane.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
The point taken into consideration here is the center of spherical surface.
This constraint simulates the tangency between the spherical part and the plane by adjusting the PointPlane distance equal to the radius of the sphere.
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Add a PointOnLine to constrain a point on to a line in 2D or 3D.
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Example :
Mouse over
the image opposite
to see an exemple :
Note :
The point and the line taken into consideration here are the center of spherical surface and the axis of the cylinder.
This constraint simulates the tangency between the spherical part and the cylindrical part by putting the point on the axis of the cylinder.
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What can be done with the proposed constraints ?
Before using any tool, it is important to know what you can do with it.
The constraints presented below make it possible to deal with the majority of cases :
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